/**
 * Copyright 2020-9999 the original author or authors.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.mykit.ddns.utils.prop;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Properties;
import java.util.Set;

/**
 * @author binghe
 * @version 1.0.0
 * @description 加载properties文件
 */
public class PropLoad {

    private static final Logger LOGGER = LoggerFactory.getLogger(PropLoad.class);

    private static volatile Properties instance;

    private static Properties getInstance(String propPath) {
        if (instance == null){
            synchronized (PropLoad.class){
                if(instance == null){
                   try{
                       InputStream in = new BufferedInputStream(new FileInputStream(propPath));
                       instance = new Properties();
                       instance.load(in);
                   }catch (IOException e){
                       LOGGER.error("加载配置文件异常：{}", e);
                   }
                }
            }
        }
        return instance;
    }

    public static Set<Object> getAllKeysFromPropertiesFile(String propPath){
        return getInstance(propPath).keySet();
    }

    public static String getValueFromPropertiesFile(String key, String propPath){
        return getInstance(propPath).getProperty(key, "");
    }

}
